<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <script src="https://cdn.tailwindcss.com"></script>
    <script>
        tailwind.config = {
            theme: {
                extend: {
                    colors: {
                        primary: '#3B82F6',
                    }
                }
            }
        }
    </script>
    <style>
        body {
            min-height: 100vh;
            background: linear-gradient(to bottom right, #1E293B, #0F172A);
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 2rem;
            margin: 0;
        }
    </style>
</head>
<body>
    <h1 class="text-5xl font-black text-primary tracking-tight">欢迎来到主界面</h1>
</body>
</html>